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MojoKid writes "iOS 6, by all appearances, has a streaming problem. This is separate from the network issues that led Verizon to state that it wouldn't bill people for overages that were caused by spotty Wi-Fi connectivity. The issue has been detailed at PRX.org with information on how the team saw a huge spike in bandwidth usage after the release of iOS 6, and then carefully tested the behavior of devices and its own app to narrow the possible cause. In one case, the playback of a single 30MB episode caused the transfer of over 100MB of data. It is believed that the issue was solved with the release of iOS 6.0.1, but anecdotal evidence from readers points to continued incidents of high data usage, even after updating. If you own an iPhone 5 or upgraded to iOS 6 on an older device, it is strongly recommend to check your usage over the past two months, update to iOS 6.0.1, and plan for a lengthy discussion with your carrier if it turns out your data use went through the roof."

Probably this is a different issue with the reported issue, but I have noticed that iOS is bypassing the wifi network and flip to cellular data network every so often (and flips back again). This happens probably a handful of times in 1 hour. This is easy to check if you have a wifi AP with tcpdump or wireshark running on it. It's especially bad when you're running VoIP app that needs to register properly so that calls can be routed to the proper IP address.